Sox (and its play renamed/linked version) will work directly with alsa, so no need to pipe it there instead. As I don't have a pw3 I can't test things directly here and have to rely on feedback from you and others. So I would in particular like you to test the ./play command and see if it works or not. I would also be interested in the output of which alsa on your pw3, as I think that might allow me to detect if it is available for me to use.
Dave
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